Mr Cameron was abused from the age of 12 while studying at a Catholic school in South Australia in the 1960s and plans to appear before the inquiry, which begins in Melbourne next week.

He has told the ABC it needs to be wrapped up quickly for the sake of victims.

"I initially said I don't care if it takes 50 years, get to the bottom of it, but give it more resources."

In 2009 Mr Cameron received a payout and formal apology from the Catholic Church's Towards Healing program, a body which deals with complaints of sexual abuse, and he plans to tell his story to the Royal Commission, saying that speaking out has helped him immensely.

"It's a life sentence. I'm glad I came out years ago and talked about it, it certainly helped me."

"If a wound is not exposed to the air, it can never heal."

Mr Cameron says it's important the Royal Commission doesn't drag on for years.

"If it's going to take nine years, how many more people are going to be dead before they hear the outcome of it?" he asked.